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Fonds consists of the organizational records of the Mariposa Folk Foundation Inc., the volunteer organization established to manage and operate the Mariposa Folk Festival. Also includes donations of material from early organizers of the Mariposa Folk Festival prior to the incorporation of the Mariposa Folk Foundation.

The fonds consists of audio recordings in various formats of performances held at The Music Gallery including performances by artists such as James Tenney, Lubomyr Melnyk, Nihilist Spasm Band, Morton Feldman, bp nichol and Casey Sokol, Roy Kiyooka, Gil Evans, Rob Frayne, Nexus, CEE, Ken Vandermark, Michael Brook, Derek Bailey and Ron Sexsmith as well as audio recordings of the CCMC's performances at The Music Gallery and the master recordings for numerous Music Gallery Editions recordings. It also contains office files consisting of financial statements, season reports, contract with performer, sales reports, grant applications, correspondence with outside organizations, programming proposals, publicity material including press releases, programs, media contact lists, clippings, photographs and other material related to the activities and the performances at The Music Gallery.

Fonds illustrates Madeleine Boss Lasserre’s career and interests as a music educator of children and adults in Toronto, Ontario. Most of the material was created between 1925 and 1977, while Lasserre was actively employed with the Margaret Eaton School and the Toronto Conservatory of Music. A small subset of the records were created outside of this time span. Records include: Dalcroze teaching and demonstration notes and diagrams; correspondence with colleagues and students; material pertaining to general early childhood education; and material related to the administration and promotion of courses in Dalcroze Eurhythmics. Fonds contains notes and notebooks, pamphlets, programmes, correspondence, clippings and scrapbooks, as well as photographs of Lasserre and other members of the Dalcroze and music communities.

Fonds consists of records pertaining to the life and work of Canadian-Scottish Jazz musician and Toronto Jazz Festival founder, Jim Galloway. Records include those pertaining to his early life in Scotland, his work as a booking agent and radio host with CKFM, his administrative roles with the Toronto Jazz Festival, and his life as a performing saxophonist. In addition to the administrative contracts, correspondence, notes, travel records, gig and festival memorabilia, sheet music, and other records pertaining to Galloway's career, the fonds includes extensive audio recordings of Galloway's radio show, Toronto Alive, as well as various other recordings created or compiled by Galloway throughout his career.